atop funziona bene e si installa facilmente anche su vecchi sistemi CentOS 5.x che non possono eseguire iotop. Premi d per mostrare i dettagli del disco, ? aiuto.
ATOP - mybox 2014/09/08 15:26:00 ------ 10s elapsed
PRC | sys 0.33s | user 1.08s | | #proc 161 | #zombie 0 | clones 31 | | #exit 16 |
CPU | sys 4% | user 11% | irq 0% | idle 306% | wait 79% | | steal 1% | guest 0% |
cpu | sys 2% | user 8% | irq 0% | idle 11% | cpu000 w 78% | | steal 0% | guest 0% |
cpu | sys 1% | user 1% | irq 0% | idle 98% | cpu001 w 0% | | steal 0% | guest 0% |
cpu | sys 1% | user 1% | irq 0% | idle 99% | cpu003 w 0% | | steal 0% | guest 0% |
cpu | sys 0% | user 1% | irq 0% | idle 99% | cpu002 w 0% | | steal 0% | guest 0% |
CPL | avg1 2.09 | avg5 2.09 | avg15 2.09 | | csw 54184 | intr 33581 | | numcpu 4 |
MEM | tot 8.0G | free 81.9M | cache 2.9G | dirty 0.8M | buff 174.7M | slab 305.0M | | |
SWP | tot 2.0G | free 2.0G | | | | | vmcom 8.4G | vmlim 6.0G |
LVM | Group00-root | busy 85% | read 0 | write 30658 | KiB/w 4 | MBr/s 0.00 | MBw/s 11.98 | avio 0.28 ms |
DSK | xvdb | busy 85% | read 0 | write 23706 | KiB/w 5 | MBr/s 0.00 | MBw/s 11.97 | avio 0.36 ms |
NET | transport | tcpi 2705 | tcpo 2008 | udpi 36 | udpo 43 | tcpao 14 | tcppo 45 | tcprs 1 |
NET | network | ipi 2788 | ipo 2072 | ipfrw 0 | deliv 2768 | | icmpi 7 | icmpo 20 |
NET | eth0 ---- | pcki 2344 | pcko 1623 | si 1455 Kbps | so 781 Kbps | erri 0 | erro 0 | drpo 0 |
NET | lo ---- | pcki 423 | pcko 423 | si 88 Kbps | so 88 Kbps | erri 0 | erro 0 | drpo 0 |
NET | eth1 ---- | pcki 22 | pcko 26 | si 3 Kbps | so 5 Kbps | erri 0 | erro 0 | drpo 0 |
PID RDDSK WRDSK WCANCL DSK CMD 1/1
9862 0K 53124K 0K 98% java
358 0K 636K 0K 1% jbd2/dm-0-8
13893 0K 192K 72K 0% java
1699 0K 60K 0K 0% syslogd
4668 0K 24K 0K 0% zabbix_agentd
Questo mostra chiaramente che il colpevole è java pid 9862.
Stai cercando iotop (supponendo che tu abbia il kernel> 2.6.20 e Python 2.5). In caso contrario, stai cercando di collegarti al filesystem. Consiglio il primo.
Per scoprire quali processi nello stato 'D' (in attesa di risposta del disco) sono attualmente in esecuzione:
while true; do date; ps aux | awk '{if($8=="D") print $0;}'; sleep 1; done
o
watch -n1 -d "ps axu | awk '{if (\$8==\"D\") {print \$0}}'"
Wed Aug 29 13:00:46 CLT 2012
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:00:47 CLT 2012
Wed Aug 29 13:00:48 CLT 2012
Wed Aug 29 13:00:49 CLT 2012
Wed Aug 29 13:00:50 CLT 2012
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:00:51 CLT 2012
Wed Aug 29 13:00:52 CLT 2012
Wed Aug 29 13:00:53 CLT 2012
Wed Aug 29 13:00:55 CLT 2012
Wed Aug 29 13:00:56 CLT 2012
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:00:57 CLT 2012
root 302 0.0 0.0 0 0 ? D May28 3:07 \_ [kdmflush]
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:00:58 CLT 2012
root 302 0.0 0.0 0 0 ? D May28 3:07 \_ [kdmflush]
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:00:59 CLT 2012
root 302 0.0 0.0 0 0 ? D May28 3:07 \_ [kdmflush]
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:01:00 CLT 2012
root 302 0.0 0.0 0 0 ? D May28 3:07 \_ [kdmflush]
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:01:01 CLT 2012
root 302 0.0 0.0 0 0 ? D May28 3:07 \_ [kdmflush]
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Wed Aug 29 13:01:02 CLT 2012
Wed Aug 29 13:01:03 CLT 2012
root 321 0.0 0.0 0 0 ? D May28 4:25 \_ [jbd2/dm-0-8]
Come puoi vedere dal risultato, jdb2/dm-0-8 (processo journal ext4) e kdmflush bloccano costantemente il tuo Linux.
Per maggiori dettagli potrebbe essere utile questo URL:Linux Wait-IO Problem